Solved Custom computer won't turn on!

February 12, 2017 at 03:22:15
Specs: Windows, I5 7600k
So i put together most of the computer and connected the cables. I put the motherboard, psu, video card, cpu and fan, and hard drive in. I dont have RAM yet but wanted to see if I was getting power. I turn it on and it turns on for half a second and went right off. The cpu fan spun just a little and quit. Lights on motherbpard lit of very shortly and quit. What could be the problem as to why and what caused this? I unplugged everything and tried again nothing.

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✔ Best Answer
February 13, 2017 at 11:29:52
From what you've said so far I think you are on the right track.

Always pop back and let us know the outcome - thanks



#1
February 12, 2017 at 07:32:34
1. you didn't post the make/model of any of the hardware.
2. you apparently put everything in the case without bench-testing it 1st.
3. two common problems that cause the system to power up momentarily & then shut down are: using a crappy power supply or improper thermal paste application between the CPU & heatsink.

Take everything out of the case & do it right - How to bench-test


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#2
February 12, 2017 at 08:39:25
The computer needs to have a least 1 stick of RAM in order to POST.

As riider pointed out above you should bench test outside the case. However, it won't work without any memory installed (RAM).


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#3
February 12, 2017 at 12:30:55
The PSU has to get a loop back signal from the motherboard otherwise it shuts down in exactly the way you have described. Fit some RAM.

Always pop back and let us know the outcome - thanks


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Related Solutions

#4
February 12, 2017 at 12:51:11
Even if no RAM is installed, the power supply should power up & it should stay powered up until it's manually shut down. If the motherboard has an integrated speaker or external speaker connected, it will continuously beep due to the lack of RAM. IMO, lack of RAM is not the problem.

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#5
February 12, 2017 at 12:54:24
That's what I heard, I was just testing to see if power was working on the parts connected, wasnt looking for display. It just shut off withon not even a second and never came back on. Also, I have Replace Power RP-ATX-850-GN power supply. If i plug it into the wall and switch it on without it connected to anything, is the fan still supposed to spin because it is not.

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#6
February 12, 2017 at 12:56:10
Also, any suggestions for two stripped screwed on the motherbpard...can't remove it because these cheap ass parts to screw into stripped i guess. I didnt even tighten it too much but it happened

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#7
February 12, 2017 at 13:07:52
Nvm, I just got the screws out thank god!

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#8
February 12, 2017 at 13:53:50
You probably used the wrong screws. Do you have screw in stand offs or do the screws go directly into the motherboard?

If you didn't connect the 8 pin CPU power to the motherboard that may happen.

message edited by OtheHill


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#9
February 12, 2017 at 13:54:27
Further to #3, see this:
http://support.antec.com/support/so...

Always pop back and let us know the outcome - thanks

message edited by Derek


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#10
February 12, 2017 at 13:55:19
Im using the screws that came with the case. I put it through the motherboard into the standoffs

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#11
February 12, 2017 at 14:04:51
Yeah i did the paperclip test last night and didnt work. Did it again just now and still didnt. I think its the psu

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#12
February 12, 2017 at 14:07:52
Sometimes the pack of screws that come with a new case includes drive mounting screws, which are different thread. The screws for the expansion boards are a third type.

I have never stripped a motherboard mounting screw in 25 years. I have had the standoffs come out instead of the mounting screw. That is because the standoff was not tightened into the case. Anyway, don't try to put another screw into that standoff or you will have the same problem.

Following up on #8 above, other causes can be, shorted out board due to standoffs installed where there is no screw hole in the board. Failure to connect CPU fan to the correct fan header. Failure to connect auxiliary power connector/s to the add in graphics card. CPU cooler incorrectly mounted. Grossly undersized power supply.


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#13
February 12, 2017 at 14:10:12
I can't even get the fan to come on at all though on my psu.

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#14
February 12, 2017 at 15:45:32
Paperclip goes from green to any black.

It appears the PSU is garbage: http://www.outletpc.com/xz6139-repl...

It's unlikely you need an 850W unit. Have a look at this Corsair 550W for just $40 after rebate: https://www.newegg.com/Product/Prod...


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#15
February 12, 2017 at 17:03:02
How To Troubleshoot a Computer That Shows No Sign of Power
http://pcsupport.about.com/od/findb...

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#16
February 13, 2017 at 11:00:07
Alright so i found somebody else that has the exact same situation and he said it ended up being the power supply, so i ordered a new one. I'll let you all know if it works

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#17
February 13, 2017 at 11:29:52
✔ Best Answer
From what you've said so far I think you are on the right track.

Always pop back and let us know the outcome - thanks


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#18
February 13, 2017 at 12:08:52
"i ordered a new one"

Hopefully you ordered a decent name brand one this time, like the one I suggested in response #14.


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#19
February 13, 2017 at 12:59:21
Idk why you felt the need to quote that. Whatever floats your boat.

Yes, "I ordered" a better one.


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#20
February 13, 2017 at 14:31:15
because junk cheap power supplies can ruin your motherboard among other things remember we are volunteers trying to help you out.

Davidw


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#21
February 14, 2017 at 14:09:59
"Idk why you felt the need to quote that"

So you know what I'm responding about.

"Yes, "I ordered" a better one"

Is there some reason why you didn't post the make/model/wattage of the "better one"? Is it a reliable name brand? 80 Plus efficiency certified? Active PFC? Single +12v rail? Adequate number of connectors for HDDs, PCIe graphics cards, etc? Decent warranty (3-5 years)?


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#22
February 14, 2017 at 14:20:19
Alright. So i just conmected the new psu and it worked! I got a SMART DPS G 750W PSU by Thermaltake. 80 Plus Gold

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#23
February 14, 2017 at 14:49:00
So, when you install the new PSU please post back with the results. Also, if the issue is then solved mark the best answer, so the thread will be marked as solved.

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#24
February 19, 2017 at 09:46:25
Been running it for a few days and computer is great. Extremely fast. Plays games perfectly

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